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Passive Termination
Passive termination does no work
to regulate power. Instead, it relies on the host adapter or device
to supply TERMPWR voltage. Passive termination is the original termination
method used for parallel SCSI. Passive terminators provide an impedance
match that is close to the impedance of the cable to minimize possible
signal reflections.
Passive termination is reliable for
bus speeds up to 10 MHz. Passive termi-nators connect a 220-Ohm resistor
to the TERMPWR line and 330-Ohm resistor to ground with an optimum impedance
match of 132 Ohms. Passive termination is adequate for short distances
(less than 1 meter) or for low speed SCSI devices such as CD-ROMs and
scanners. Passive termination is not recommended if there are more
than two peripheral devices on the bus.
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CertiGuide to A+ (A+ 4 Real) (http://www.CertiGuide.com/apfr/) on CertiGuide.com
Version 1.0 - Version Date: March 29, 2005
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